Please refer to the MCQ Questions for Class 12 Chemistry Chapter 7 The p Block Elements with Answers. The following The p Block Elements Class 12 Chemistry MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 12. Our experts have designed MCQ Questions for Class 12 Chemistry with Answers for all chapters in your NCERT Class 12 Chemistry book.
The p Block Elements Class 12 MCQ Questions with Answers
See below The p Block Elements Class 12 Chemistry MCQ Questions, solve the questions and compare your answers with the solutions provided below.
Question. Which would quickly absorb oxygen?
(a) Alkaline solution of pyrogallol
(b) Conc. H2SO4
(c) Lime water
(d) Alkaline solution of CuSO4
Question. Oxygen will directly react with each of the following elements except
Question. It is possible to obtain oxygen from air by fractional distillation because
(a) oxygen is in a different group of the periodic table from nitrogen
(b) oxygen is more reactive than nitrogen
(c) oxygen has higher b.pt. than nitrogen
(d) oxygen has a lower density than nitrogen.
Question. The angular shape of ozone molecule (O3) consists of
(a) 1s and 1p bond
(b) 2s and 1p bond
(c) 1s and 2p bonds
(d) 2s and 2p bonds.
Question. The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are
(a) O3, CH4
(b) O2, O3
(c) SO2, CH4
(d) N2O, O3
Question. Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?
(a) Is soluble in water.
(b) Is used as a food preservative.
(c) Forms ‘acid-rain’.
(d) Is a reducing agent.
Question. Which of the following oxoacid of sulphur has — O — O — linkage
(a) H2SO3, sulphurous acid
(b) H2SO4, sulphuric acid
(c) H2S2O8, peroxodisulphuric acid
(d) H2S2O7, pyrosulphuric acid
Question. Identify the correct formula of oleum from the following :
Question. In which pair of ions both the species contain S — S bond?
(a) S4O62–, S2O32–
(b) S2O72–, S2O82–
(c) S4O62–, S2O72–
(d) S2O72–, S2O32–
Question. Oleum is
(a) castor oil
(b) oil of vitriol
(c) fuming H2SO4
(d) none of these.
Question. CIO– disproportionate into
(a) CIO– and O
(b) CI– and ClO–3
(c) Cl and O
(d) Cl– and O–
Question. The following species will not exhibit disproportionation reaction
Question. Which one of the following reactions does not occur ?
(a) F2 + 2Cl– → 2F– + Cl2
(b) Cl2 + 2F– → 2Cl– + F2
(c) Br2 + 2l– → 2Br– + l2
(d) Cl2 + 2Br– → 2Cl– + Br2
Question. Which of the following pairs has bleaching property?
(a) O3and NO2
(b) O3 and H2S
(c) SO2 and Cl2
(d) Cl2 and NO2
Question. The correct order of heat of formation of halogen acids is
(a) HI > HBr > HCl > HF
(b) HF > HCl > HBr > HI
(c) HCl > HF > HBr > HI
(d) HCl > HBr > HF > HI
Question. When chlorine reacts with di!. NaOH under cold conditions, the oxidation state of chlorine changes from zero to
(a) – 1 and + 5
(b) + 1 and + 4
(c) + 5 and + 3
(d) – 1 and + 1
Question. Which of the following dissolves in water but does not give any oxyacid solution?
Question. Identify the incorrect statement among the following.
(a) Ozone reacts with SO2 to give SO3
(b) Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2O
(c) Cl2 reacts with excess of NH3 to give N2 and HCl
(d) Br2 reacts with hot and strong NaOH solution to give NaBr, NaBrO4 and H2O
Question. Among K, Ca, Fe and Zn, the element which can form more than one binary compound with chlorine is
Question. Which one of the following reacts with glass?
Question. Which one of the following can be purified by sublimation ?
Question. In which case, the order of acidic strength is not correct?
(a) HI > HBr > HCl
(b) HIO4 > HBrO2 > HCIO2
(c) HCIO2 > HCIO3 > HCIO2
(d) HF > H2O > NH3
Question. Iodine readily dissolves in potassium iodide solution giving
Question. Which of the following is anhydride of perchloric acid ?
Question. Correct order of electron affinities of halogens is
(a) F > Cl > Br > I
(b) I > Br > Cl > F
(c) Cl > F > I > Br
(d) Cl > F > Br > I
Question. Which among the following factors is the most important in making fluorine the strongest oxidising agent?
(a) Electron affinity
(b) Ionisation enthalpy
(c) Hydration enthalpy
(d) Bond dissociation energy
Question. Most acidic oxide among the following is
Question. Least stable oxide of chlorine is
Question. Which reaction is not valid?
(a) HCl + F2 → HF + Cl2
(b) HF + Cl2 → F2 + HCI
(c) Zn+ HCl → ZnCl2 + H2
(d) Al + HCI → AICl3 + H2
Question. What products are expected from the disproportionation reaction of hypochlorous acid ?
(a) HCIO3 and Cl2O
(b) HCIO2 and HCIO4
(c) HCl and Cl2O
(d) HCl and HCIO3
Question. Which of the following statements is not true for halogens?
(a) All form monobasic oxyacids.
(b) All are oxidizing agents.
(c) All but fluorine show positive oxidation states.
(d) Chlorine has the highest electron-gain enthalpy.
Question. Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
(a) Br2 > I2 > F2 > Cl2
(b) F2 > Cl2 > Br2 > I2
(c) I2 > Br2 > Cl2 > F2
(d) Cl2 > Br2 > F2 > I2
Question. The variation of the boiling points of the hydrogen halides is in the order HF > HI > HBr > HCl.
What explains the higher boiling point of hydrogen fluoride?
(a) There is strong hydrogen bonding between HF molecules.
(b) The bond energy of HF molecules is greater than in other hydrogen halides.
(c) The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule.
(d) The electronegativity of fluorine is much higher than for other elements in the group.
Question. Among the following which is the strongest oxidising agent?
Question. Which one of the following arrangements does not give the correct picture of the trends indicated against it?
(a) F2 > Cl2 > Br2 > I2 : Bond dissociation energy
(b) F2 > Cl2 > Br2 > I2 : Electronegativity
(c) F2 > Cl2 > Br2 > I2 : Oxidizing power
(d) F2 > Cl2 > Br2 > I2 : Electron gain enthalpy
Question. Which one of the following orders is not in accordance with the property stated against it?
(a) F2 > Cl2 > Br2 > I2 : Bond dissociation energy
(b) F2 > Cl2 > Br2 > I2 : Oxidising power
(c) HI > HBr > HCl > HF : Acidic property in water
(d) F2 > Cl2 > Br2 > I2 : Electronegativity
Question. Which statement is wrong?
(a) Bond energy of F2 > Cl2
(b) Electronegativity of F > Cl
(c) F is more oxidising than Cl
(d) Electron affinity of Cl > F
Question. Which of the following has the greatest electron affinity?
Question. Which of the following displaces Br2 from an aqueous solution containing bromide ions?
Question. Which of the following species has four lone pairs of electrons?
Question. When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
(a) zero to +1 and zero to –5
(b) zero to –1 and zero to +5
(c) zero to –1 and zero to +3
(d) zero to +1 and zero to –3
Question. Which of the following is used in the preparation of chlorine?
(a) Both MnO2 and KMnO4
(b) Only KMnO4
(c) Only MnO2
(d) Either MnO2 or KMnO4
Question. Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound?
Question. When chlorine is passed over dry slaked lime at room temperature, the main reaction product is
Question. In the manufacture of bromine from sea water, the mother liquor containing bromides is treated with
(a) carbon dioxide
(d) sulphur dioxide.
Question. The bleaching action of chlorine is due to
(d) oxidation. 7.20 Hydrogen Chloride
Question. Bleaching powder reacts with a few drops of conc. HCl to give
(b) hypochlorous acid
(c) calcium oxide
Question. Among the following, the correct order of acidity is
(a) HClO2 < HClO < HClO3 < HClO4
(b) HClO4 < HClO2 < HClO < HClO3
(c) HClO3 < HClO4 < HClO2 < HClO
(d) HClO < HClO2 < HClO3 < HClO4
Question. Which of the statements given below is incorrect?
(a) O3 molecule is bent.
(b) ONF is isoelectronic with O2N–.
(c) OF2 is an oxide of fluorine.
(d) Cl2O7 is an anhydride of perchloric acid.
Question. The correct order of increasing bond angles in the following species is
(a) Cl2O < ClO2 < ClO2–
(b) ClO2 < Cl2O < ClO2–
(c) Cl2O < ClO2– < ClO2
(d) ClO2– < Cl2O < ClO2
Question. Which one of the following oxides is expected to exhibit paramagnetic behaviour?
Question. Identify the incorrect statement, regarding the molecule XeO4.
(a) XeO4 molecule is square planar.
(b) There are four pp – dp bonds.
(c) There are four sp3 – p, s bonds.
(d) XeO4 molecule is tetrahedral.
Question. Which compound has planar structure?
Question. The ion or group detected by K2[HgI4] is :
Question. H2S does not produce metallic sulphide with :
Question. Which gas cannot be collected over water ?
Question. The shape of Xenon tetra fluorides ( XeF4) is –
(b) Square pyramidal
(c) Square planar
(d) None of above
Question. The least basic hydride of 15 th group elements is –
Question. The most stable hydride of 15 th group elements is –
Question. Which of the following elements can be involved in pπ–dπ bonding?
Question. Which of the following pairs of ions are isoelectronic and isostructural?
(a) CO32–, NO3–
(b) ClO3– , CO32–
(c) SO32–, NO3–
(d) ClO3– , SO32–
Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
(a) Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
(b) Both assertion and reason are correct statements, but reason is not the correct explanation of the assertion.
(c) Assertion is correct, but reason is wrong statement.
(d) Assertion is wrong but reason is correct statement.
(e) Both assertion and reason are wrong statements
Question. Assertion : N2 is less reactive than P4.
Reason : Nitrogen has more electron gain enthalpy than phosphorus.
Question. Assertion : HNO3 makes iron passive.
Reason : HNO3 forms a protective layer of ferric nitrate on the surface of iron.
Question.Assertion : HI cannot be prepared by reaction of KI with concentrated H2SO4
Reason : HI has lowest H–X bond strength among halogen acids.
Question. Which of the following elements does not show allotropy?
Question. Maximum covalency of nitrogen is